To grow as an individual, the INTP needs to focus on taking in as much information as possible through Extraverted Intuition. He or she needs to allow themself to get into situations that they aren't necessarily comfortable with, or that are different from the situations that they would normally choose in life. The INTP learns from experience, so the best way for the INTP to grow as a person is to open him or herself to new experiences. Be aware of the tendency to want to run out and do something "new" that is actually just a different opportunity to exercise a known skill. Your task, as a person interested in personal growth, is to understand the world in a truly objective fashion, and how you fit into the world, rather than how the world fits into your life.
The INTP should also pay close attention to their motivations when perceiving new information. Are they perceiving with an open mind or with an agenda? Are they seeking to truly understand something, or are they more concerned with turning the information into a logical conclusion? Seek first to understand, then to judge.